DNS Blacklisting

In an effort to reduce the amount of undesirable e-mail that enters our network, Sterling has elected to refuse mail from servers that are found on the DNS Blacklists of third-party organizations.

These independent organizations maintain lists of mail servers that have allowed spam to be sent directly from their server, or have configurations that allow spam to be relayed through their server.

When any server attempts to deliver mail to Sterling Insurance, our system is configured to verify the sender against several Blacklists. If the IP address of the incoming server is found on any list, the connection is refused and a rejection notice is returned to the sender.

If you have received such a rejection notice, and your organization maintains its own mail server, you may wish to notify your mail system administrators of the situation so that they can resolve the issue and take the necessary steps to remove the server from the listing organization. If your mail is hosted by your Internet Service Provider (ISP) or another outside agency, you may wish to notify them of the situation.

Although this solution has dramatically reduced the amount of unwanted e-mail that has entered our network, we do realize that occasionally legitimate business partners are being blocked. Please feel free to contact the intended recipient of your communication to discuss alternative methods of transfer, and do not hesitate to contact a member of Sterling’s Network Administration Team if you have any questions.